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Updated: May 21, 2025
See also, Le Problème Solaire, by l'Abbé Th. Roche in 1872. On the 2nd of June, 1858, Giambattista Donati discovered at Florence a feeble round nebulosity in the constellation Leo, about one-tenth the diameter of the full moon. It proved to be a comet approaching the sun. But it changed little in apparent place or brightness for some weeks.
But this was the direct and simple, not the concentrated or accumulated heat of the sun. On the utilizing of the solar heat, simply as heat, see the work of Mouchot, La Chaleur solaire et ses applications industrielles. Paris, 1860. The reciprocal convertibility of the natural forces has suggested the possibility of advantageously converting the heat of the sun into mechanical power.
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